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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +02002 * Copyright (c) 1991,1992,1995 Linus Torvalds
3 * Copyright (c) 1994 Alan Modra
4 * Copyright (c) 1995 Markus Kuhn
5 * Copyright (c) 1996 Ingo Molnar
6 * Copyright (c) 1998 Andrea Arcangeli
7 * Copyright (c) 2002,2006 Vojtech Pavlik
8 * Copyright (c) 2003 Andi Kleen
Linus Torvalds1da177e2005-04-16 15:20:36 -07009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
Thomas Gleixnerecce8502009-08-20 15:28:50 +020012#include <linux/clockchips.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/interrupt.h>
14#include <linux/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/mca.h>
16
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +020017#include <asm/vsyscall.h>
18#include <asm/x86_init.h>
Thomas Gleixnerecce8502009-08-20 15:28:50 +020019#include <asm/i8259.h>
20#include <asm/i8253.h>
Thomas Gleixnerdd3e6e82009-08-20 15:35:23 +020021#include <asm/timer.h>
22#include <asm/hpet.h>
23#include <asm/time.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Thomas Gleixner454ede72009-08-20 16:07:40 +020025#ifdef CONFIG_X86_64
Andy Lutomirski8c49d9a2011-05-23 09:31:24 -040026DEFINE_VVAR(volatile unsigned long, jiffies) = INITIAL_JIFFIES;
Thomas Gleixner454ede72009-08-20 16:07:40 +020027#endif
28
Linus Torvalds1da177e2005-04-16 15:20:36 -070029unsigned long profile_pc(struct pt_regs *regs)
30{
31 unsigned long pc = instruction_pointer(regs);
32
Glauber Costa2c44e662008-07-11 13:48:07 -030033 if (!user_mode_vm(regs) && in_lock_functions(pc)) {
Andi Kleen0cb91a22006-09-26 10:52:28 +020034#ifdef CONFIG_FRAME_POINTER
Glauber Costa2c460d02008-07-11 16:06:40 -030035 return *(unsigned long *)(regs->bp + sizeof(long));
Andi Kleen0cb91a22006-09-26 10:52:28 +020036#else
H. Peter Anvind1705c52009-10-12 11:32:31 -070037 unsigned long *sp =
38 (unsigned long *)kernel_stack_pointer(regs);
Thomas Gleixneref451282009-08-21 13:24:08 +020039 /*
40 * Return address is either directly at stack pointer
41 * or above a saved flags. Eflags has bits 22-31 zero,
42 * kernel addresses don't.
43 */
Thomas Gleixnerfe599f92008-01-30 13:30:26 +010044 if (sp[0] >> 22)
Andi Kleen0cb91a22006-09-26 10:52:28 +020045 return sp[0];
46 if (sp[1] >> 22)
47 return sp[1];
48#endif
49 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 return pc;
51}
52EXPORT_SYMBOL(profile_pc);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/*
Thomas Gleixner454ede72009-08-20 16:07:40 +020055 * Default timer interrupt handler for PIT/HPET
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 */
Thomas Gleixner845b3942009-08-19 15:37:03 +020057static irqreturn_t timer_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
Thomas Gleixner3c9aea42007-10-12 23:04:06 +020059 /* Keep nmi watchdog up to date */
Hiroshi Shimamoto8ae93662008-12-12 15:52:26 -080060 inc_irq_stat(irq0_irqs);
Thomas Gleixner3c9aea42007-10-12 23:04:06 +020061
Thomas Gleixnerecce8502009-08-20 15:28:50 +020062 global_clock_event->event_handler(global_clock_event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Thomas Gleixner0be69392009-08-20 15:59:35 +020064 /* MCA bus quirk: Acknowledge irq0 by setting bit 7 in port 0x61 */
65 if (MCA_bus)
66 outb_p(inb_p(0x61)| 0x80, 0x61);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 return IRQ_HANDLED;
69}
70
Thomas Gleixner845b3942009-08-19 15:37:03 +020071static struct irqaction irq0 = {
72 .handler = timer_interrupt,
73 .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
74 .name = "timer"
75};
76
77void __init setup_default_timer_irq(void)
78{
Thomas Gleixner845b3942009-08-19 15:37:03 +020079 setup_irq(0, &irq0);
80}
81
82/* Default timer init function */
Zachary Amsdene30fab32007-03-05 00:30:39 -080083void __init hpet_time_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070084{
Thomas Gleixnere9e2cdb2007-02-16 01:28:04 -080085 if (!hpet_enable())
86 setup_pit_timer();
Thomas Gleixner845b3942009-08-19 15:37:03 +020087 setup_default_timer_irq();
88}
89
Thomas Gleixner54e26032009-09-16 08:42:26 +020090static __init void x86_late_time_init(void)
Thomas Gleixner845b3942009-08-19 15:37:03 +020091{
92 x86_init.timers.timer_init();
Thomas Gleixnerdd0a70c2009-08-20 16:51:07 +020093 tsc_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Zachary Amsdene30fab32007-03-05 00:30:39 -080096/*
Thomas Gleixner845b3942009-08-19 15:37:03 +020097 * Initialize TSC and delay the periodic timer init to
98 * late x86_late_time_init() so ioremap works.
Zachary Amsdene30fab32007-03-05 00:30:39 -080099 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100void __init time_init(void)
101{
Thomas Gleixner845b3942009-08-19 15:37:03 +0200102 late_time_init = x86_late_time_init;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103}